Through which parts of the heart does oxygen poor blood flow

The four principles of natural selection are variation, inheritance, high rate of population growth, and differential survival and reproduction. These principles explain the differences in traits among individuals within a species, the hereditary nature of some of these traits, overproduction of offspring, and the survival advantage of favorable traits.

The four principles of natural selection are: Variation, Inheritance, High Rate of Population Growth, and Differential Survival and Reproduction.

The principle of Variation explains that within a population, individuals have diverse traits, these differences could be physical or behavioral. The principle of Inheritance explains that some of these traits are hereditary and can be passed on to the next generation.

The principle of a High Rate of Population Growth says that most species produce more offspring than can survive given the limited resources, and thus many offspring do not survive to reproductive age. The principle of Differential Survival and Reproduction suggests that those individuals with the most favorable traits are more likely to survive and reproduce, thereby passing on these traits to the next generation. This is often referred to as 'survival of the fittest'.

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Answer:

    There is not just one type of respiratory infection, but several infections that can reach the respiratory tract, some lighter and some more severe. Some of the most common causes of respiratory infections include:

    These infections can be classified as acute when they appear suddenly and rapidly worsen, or as chronic when they have a long lasting, sluggish course and difficult to treat, which often happens in certain cases of sinusitis, bronchitis or tuberculosis. , for example.

Answer:

different

Explanation:

Sue McGrew is a professional sand sculptor from Seattle.  She makes amazing sand sculptures that last for few weeks or can vanish in one day. She creates sculpture using beach sand, water and same hand tools. Sue McGrew started making sculpture as hobby and then it became passion for her. She expresses her thought in sand.  

 During the follicular phase, granulosa cells secrete estrogen, which stimulates secretion of gonadotropin-releasing hormone (GnRH), which then increases production of luteinizing hormone (LH). The follicular phase is the phase of the menstrual cycle, during which follicles in the ovary mature and it ends with ovulation.

During the follicular phase, granulosa cells secrete estrogen which stimulates the secretion of gonadotropins such as FSH and LH.

During the follicular phase, granulosa cells secrete estrogen, which stimulates the secretion of gonadotropins by the anterior pituitary gland. Specifically, Follicle-stimulating hormone (FSH) stimulates the follicles leading to their growth and secretion of estrogens. Granulosa and theca cells, upon receiving Luteinizing hormone (LH), produce the sex steroid hormone estradiol. This increase in estrogen levels results in a negative feedback loop that regulates the secretion of GnRH, FSH, and LH to optimize the chances of one dominant follicle reaching maturation and ovulating an egg cell.

The biodiversity of an ecosystem depends on the area of ecosystem as well as the factors that surrounds the ecosystem.

An ecosystem may be defined as a geographic area where plants, animals, and other organisms interact together for the need of one another.

Biodiversity refers to the variety of life on Earth at all levels, from genes to ecosystems exist. The biodiversity of a large ecosystem is usually higher as compared to small ecosystem. It also depends on the factors that surrounds the ecosystem.

Therefore, it is described above.

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The cardiac sphincter which is found at the upper part of the stomach guards the entry of food into the stomach. Cardiac sphincter performs essential roles in digestion as it keeps stomach acids and other stomach contents from pushing up and into the esophagus.

The human eye is grief in damage of in-depth perception, color recognition, and peripheral vision. Judging speed and distance based on visual evidence is also more difficult in the dark.  In addition, the darkness of night, and even the dimness of dusk and dawn.  

Answer:

He human eye is poorly suited to night vision, suffering impairments in seeing the environment in low light situations.

Explanation:

In the eyes are the rods, the neurons responsible for the night vision. In total darkness, there is a need for at least 45 minutes to get the best vision, because the human eye is poorly adapted to night vision and is deficient in seeing in the dark. In the retina of the human eye there are two distinct regions, one responds by the central vision, the macula, and another peripheral vision.

Inside the macula, a region called fovea consists only of cones, which are neurons responsible for maximum vision. The cones do not work in low light conditions. However, around the fovea, there is a mixture of conese rods. This blend allows an intermediate view, which guarantees the ability to see in the penumbra.

Student 1’s methods would be more accurate, because the student would control more factors. Only one variable at a time (either temperature or acidity) would be tested on each group of worms. On the other hand, Student 2 is testing both factors on all the worms, which could make the results unclear.

Student 1 is taking  different groups of worms, so his result will be more accurate, because the same group of worms may show the same or more related result.

Flatworms came under phylum platyhelminths.

They are unsegmented, bilateral, and soft bodied organism.

In the given experiment, the student 2 is taking the same group of flatworm, which may have some same characteristics and response to stimuli.

The result can be not ideal.

The student 1 is taking different groups of flatworm.

It will show correct and distinctive result.

Thus, student 1 will show accurate result.

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The development of specialized tissues and organs in a multicellular organism's embryo occurs as a result of the differentiation process.

What is Embryo?

An unborn baby at an early stage of development in the uterus is called an embryo. It is responsible for the development of simple to complex structures in the body of multicellular organisms.

Differentiation is a process of the generation of specialized cell types and organs in multicellular organisms. During this process, a cell ceases to divide and develops specialized structural elements and distinct functional properties.

Therefore, the development of specialized tissues and organs in a multicellular organism's embryo occurs as a result of the differentiation process.

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The binding of epinephrine to its receptor activates g-protein which in turn activates adenylyl cyclase.

When epinephrine binds to its receptor, it triggers a cascade of events leading to the conversion of ATP to CAMP by adenylyl cyclase. This signaling pathway plays a crucial role in mediating cell-specific responses.

Answer:

the answer is C

Explanation:

Research indicates that skipping breakfast increases food portion intake for the rest of the day. This is due to increased hunger pangs. This result to overeating in the other meals of the day, by especially craving for foods with higher energy densities. Eating breakfast is usually advisable for person tying to lose weight or avoid obesity.

The answer is resulting into the effect of overeating in different meals of the day.

It is all because of the hunger increased pangs that will be responsible for skipping of the food meals. This will be resulting into the overeating of the meals at the high energy based densities.